---
kind: "section"
citation: "46 C.F.R. § 53.05-2"
title: "46"
number: "53.05-2"
heading: "Relief valve requirements for hot water boilers (modifies HG-400.2)."
url: "https://uscodex.org/cfr/46/53.05-2"
---

# §53.05-2. Relief valve requirements for hot water boilers (modifies HG-400.2).

- (a) **Relief valves.** The relief valve requirements for hot water boilers must be as indicated in article 4 of Section IV of the ASME BPVC (incorporated by reference; see [§ 53.01-1](/cfr/46/53.01-1.md)) except as noted otherwise in this section.
- (b) **Hot water heating boilers.** Each hot water heating boiler must have at least one safety relief valve.
- (c) **Hot water supply boilers.** Each hot water supply boiler must have at least one safety relief valve and a temperature relief valve or a pressure-temperature relief valve. The valve temperature setting must not be more than 99 °C (210 °F).

## Notes

### Amendments

[CGD 81-79, 50 FR 9435, Mar. 8, 1985, as amended by USCG-2003-16630, 73 FR 65163, Oct. 31, 2008]

### Source

Source: CGD 81-79, 50 FR 9435, Mar. 8, 1985, unless otherwise noted.

### Authority

Authority: 46 U.S.C. 3306, 3703; E.O. 12234, 45 FR 58801, 3 CFR, 1980 Comp., p. 277; Department of Homeland Security Delegation No. 00170.1, Revision No. 01.3.

### Source

Source: CGFR 68-82, 33 FR 18826, Dec. 18, 1968, as amended by USCG-2020-0634, 89 FR 50102, June 12, 2024, unless otherwise noted.

### Amendments

[CGD 81-79, 50 FR 9435, Mar. 8, 1985, as amended by USCG-2003-16630, 73 FR 65163, Oct. 31, 2008]